1 /* $OpenBSD: asn1_par.c,v 1.28 2020/01/09 11:27:21 inoguchi Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/buffer.h> 63 #include <openssl/objects.h> 64 65 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed, 66 int indent); 67 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, 68 int offset, int depth, int indent, int dump); 69 70 static int 71 asn1_print_info(BIO *bp, int tag, int xclass, int constructed, 72 int indent) 73 { 74 char str[128]; 75 const char *p; 76 77 if (constructed & V_ASN1_CONSTRUCTED) 78 p="cons: "; 79 else 80 p="prim: "; 81 if (BIO_write(bp, p, 6) < 6) 82 goto err; 83 BIO_indent(bp, indent, 128); 84 85 p = str; 86 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE) 87 snprintf(str, sizeof str, "priv [ %d ] ", tag); 88 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC) 89 snprintf(str, sizeof str, "cont [ %d ]", tag); 90 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION) 91 snprintf(str, sizeof str, "appl [ %d ]", tag); 92 else if (tag > 30) 93 snprintf(str, sizeof str, "<ASN1 %d>", tag); 94 else 95 p = ASN1_tag2str(tag); 96 97 if (BIO_printf(bp, "%-18s", p) <= 0) 98 goto err; 99 return (1); 100 err: 101 return (0); 102 } 103 104 int 105 ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent) 106 { 107 return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0)); 108 } 109 110 int 111 ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump) 112 { 113 return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump)); 114 } 115 116 static int 117 asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset, 118 int depth, int indent, int dump) 119 { 120 const unsigned char *p, *ep, *tot, *op, *opp; 121 long len; 122 int tag, xclass, ret = 0; 123 int nl, hl, j, r; 124 ASN1_OBJECT *o = NULL; 125 ASN1_OCTET_STRING *os = NULL; 126 ASN1_INTEGER *ai = NULL; 127 ASN1_ENUMERATED *ae = NULL; 128 /* ASN1_BMPSTRING *bmp=NULL;*/ 129 int dump_indent; 130 131 dump_indent = 6; /* Because we know BIO_dump_indent() */ 132 p = *pp; 133 tot = p + length; 134 op = p - 1; 135 if (depth > 128) { 136 BIO_printf(bp, "Max depth exceeded\n"); 137 goto end; 138 } 139 while ((p < tot) && (op < p)) { 140 op = p; 141 j = ASN1_get_object(&p, &len, &tag, &xclass, length); 142 143 if (j & 0x80) { 144 if (BIO_write(bp, "Error in encoding\n", 18) <= 0) 145 goto end; 146 ret = 0; 147 goto end; 148 } 149 hl = (p - op); 150 length -= hl; 151 /* if j == 0x21 it is a constructed indefinite length object */ 152 if (BIO_printf(bp, "%5ld:", (long)offset + 153 (long)(op - *pp)) <= 0) 154 goto end; 155 156 if (j != (V_ASN1_CONSTRUCTED | 1)) { 157 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ", 158 depth, (long)hl, len) <= 0) 159 goto end; 160 } else { 161 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", 162 depth, (long)hl) <= 0) 163 goto end; 164 } 165 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0)) 166 goto end; 167 if (j & V_ASN1_CONSTRUCTED) { 168 ep = p + len; 169 if (BIO_write(bp, "\n", 1) <= 0) 170 goto end; 171 if (len > length) { 172 BIO_printf(bp, "length is greater than %ld\n", 173 length); 174 ret = 0; 175 goto end; 176 } 177 if ((j == 0x21) && (len == 0)) { 178 for (;;) { 179 r = asn1_parse2(bp, &p, (long)(tot - p), 180 offset + (p - *pp), depth + 1, 181 indent, dump); 182 if (r == 0) { 183 ret = 0; 184 goto end; 185 } 186 if ((r == 2) || (p >= tot)) { 187 len = (long)(p - ep); 188 break; 189 } 190 } 191 } else { 192 while (p < ep) { 193 r = asn1_parse2(bp, &p, (long)(ep - p), 194 offset + (p - *pp), depth + 1, 195 indent, dump); 196 if (r == 0) { 197 ret = 0; 198 goto end; 199 } 200 } 201 } 202 } else if (xclass != 0) { 203 p += len; 204 if (BIO_write(bp, "\n", 1) <= 0) 205 goto end; 206 } else { 207 nl = 0; 208 if ((tag == V_ASN1_PRINTABLESTRING) || 209 (tag == V_ASN1_T61STRING) || 210 (tag == V_ASN1_IA5STRING) || 211 (tag == V_ASN1_VISIBLESTRING) || 212 (tag == V_ASN1_NUMERICSTRING) || 213 (tag == V_ASN1_UTF8STRING) || 214 (tag == V_ASN1_UTCTIME) || 215 (tag == V_ASN1_GENERALIZEDTIME)) { 216 if (BIO_write(bp, ":", 1) <= 0) 217 goto end; 218 if ((len > 0) && 219 BIO_write(bp, (const char *)p, (int)len) != 220 (int)len) 221 goto end; 222 } else if (tag == V_ASN1_OBJECT) { 223 opp = op; 224 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != 225 NULL) { 226 if (BIO_write(bp, ":", 1) <= 0) 227 goto end; 228 i2a_ASN1_OBJECT(bp, o); 229 } else { 230 if (BIO_write(bp, ":BAD OBJECT", 231 11) <= 0) 232 goto end; 233 } 234 } else if (tag == V_ASN1_BOOLEAN) { 235 int ii; 236 237 opp = op; 238 ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl); 239 if (ii < 0) { 240 if (BIO_write(bp, "Bad boolean\n", 241 12) <= 0) 242 goto end; 243 } 244 BIO_printf(bp, ":%d", ii); 245 } else if (tag == V_ASN1_BMPSTRING) { 246 /* do the BMP thang */ 247 } else if (tag == V_ASN1_OCTET_STRING) { 248 int i, printable = 1; 249 250 opp = op; 251 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl); 252 if (os != NULL && os->length > 0) { 253 opp = os->data; 254 /* testing whether the octet string is 255 * printable */ 256 for (i = 0; i < os->length; i++) { 257 if (((opp[i] < ' ') && 258 (opp[i] != '\n') && 259 (opp[i] != '\r') && 260 (opp[i] != '\t')) || 261 (opp[i] > '~')) { 262 printable = 0; 263 break; 264 } 265 } 266 if (printable) { 267 /* printable string */ 268 if (BIO_write(bp, ":", 1) <= 0) 269 goto end; 270 if (BIO_write(bp, (const char *)opp, 271 os->length) <= 0) 272 goto end; 273 } else if (!dump) { 274 /* not printable => print octet string 275 * as hex dump */ 276 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0) 277 goto end; 278 for (i = 0; i < os->length; i++) { 279 if (BIO_printf(bp, 280 "%02X", opp[i]) <= 0) 281 goto end; 282 } 283 } else { 284 /* print the normal dump */ 285 if (!nl) { 286 if (BIO_write(bp, "\n", 1) <= 0) 287 goto end; 288 } 289 if (BIO_dump_indent(bp, 290 (const char *)opp, 291 ((dump == -1 || dump > 292 os->length) ? os->length : dump), 293 dump_indent) <= 0) 294 goto end; 295 nl = 1; 296 } 297 } 298 ASN1_OCTET_STRING_free(os); 299 os = NULL; 300 } else if (tag == V_ASN1_INTEGER) { 301 int i; 302 303 opp = op; 304 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl); 305 if (ai != NULL) { 306 if (BIO_write(bp, ":", 1) <= 0) 307 goto end; 308 if (ai->type == V_ASN1_NEG_INTEGER) 309 if (BIO_write(bp, "-", 1) <= 0) 310 goto end; 311 for (i = 0; i < ai->length; i++) { 312 if (BIO_printf(bp, "%02X", 313 ai->data[i]) <= 0) 314 goto end; 315 } 316 if (ai->length == 0) { 317 if (BIO_write(bp, "00", 2) <= 0) 318 goto end; 319 } 320 } else { 321 if (BIO_write(bp, "BAD INTEGER", 11) <= 0) 322 goto end; 323 } 324 ASN1_INTEGER_free(ai); 325 ai = NULL; 326 } else if (tag == V_ASN1_ENUMERATED) { 327 int i; 328 329 opp = op; 330 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); 331 if (ae != NULL) { 332 if (BIO_write(bp, ":", 1) <= 0) 333 goto end; 334 if (ae->type == V_ASN1_NEG_ENUMERATED) 335 if (BIO_write(bp, "-", 1) <= 0) 336 goto end; 337 for (i = 0; i < ae->length; i++) { 338 if (BIO_printf(bp, "%02X", 339 ae->data[i]) <= 0) 340 goto end; 341 } 342 if (ae->length == 0) { 343 if (BIO_write(bp, "00", 2) <= 0) 344 goto end; 345 } 346 } else { 347 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0) 348 goto end; 349 } 350 ASN1_ENUMERATED_free(ae); 351 ae = NULL; 352 } else if (len > 0 && dump) { 353 if (!nl) { 354 if (BIO_write(bp, "\n", 1) <= 0) 355 goto end; 356 } 357 if (BIO_dump_indent(bp, (const char *)p, 358 ((dump == -1 || dump > len) ? len : dump), 359 dump_indent) <= 0) 360 goto end; 361 nl = 1; 362 } 363 364 if (!nl) { 365 if (BIO_write(bp, "\n", 1) <= 0) 366 goto end; 367 } 368 p += len; 369 if ((tag == V_ASN1_EOC) && (xclass == 0)) { 370 ret = 2; /* End of sequence */ 371 goto end; 372 } 373 } 374 length -= len; 375 } 376 ret = 1; 377 378 end: 379 if (o != NULL) 380 ASN1_OBJECT_free(o); 381 ASN1_OCTET_STRING_free(os); 382 ASN1_INTEGER_free(ai); 383 ASN1_ENUMERATED_free(ae); 384 *pp = p; 385 return (ret); 386 } 387 388 const char * 389 ASN1_tag2str(int tag) 390 { 391 static const char * const tag2str[] = { 392 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */ 393 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */ 394 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */ 395 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */ 396 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */ 397 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", /* 21-24 */ 398 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */ 399 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */ 400 }; 401 402 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED)) 403 tag &= ~0x100; 404 405 if (tag < 0 || tag > 30) 406 return "(unknown)"; 407 return tag2str[tag]; 408 } 409